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      <a id="ftgen"></a>
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      <a id="IndexFtgen" class="indexterm"></a>
      <div class="refnamediv">
        <h2>
          <span class="refentrytitle">ftgen</span>
        </h2>
        <p>ftgen — 
      Generate a score function table from within the orchestra.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp111581216"></a>
        <h2>Description</h2>
        <p>Generate a score function table from within the orchestra.</p>
      </div>
      <div class="refsect1">
        <a id="idp111582400"></a>
        <h2>Syntax</h2>
        <pre class="synopsis">gir <span class="command"><strong>ftgen</strong></span> ifn, itime, isize, igen, iarga [, iargb ] [...]</pre>
      </div>
      <div class="refsect1">
        <a id="idp111584672"></a>
        <h2>Initialization</h2>
        <p>
      <span class="emphasis"><em>gir</em></span> -- either a requested or automatically assigned table number above 100.
    </p>
        <p> 
      <span class="emphasis"><em>ifn</em></span> -- requested table number If <span class="emphasis"><em>ifn</em></span> is zero, the number is assigned automatically and the value placed in <span class="emphasis"><em>gir</em></span>. Any other value is used as the table number
    </p>
        <p>
      <span class="emphasis"><em>itime</em></span> -- is ignored, but otherwise corresponds to p2 in the score <span class="emphasis"><em>f statement</em></span>.
    </p>
        <p>
      <span class="emphasis"><em>isize</em></span> -- table size. Corresponds to p3 of the score <span class="emphasis"><em>f statement</em></span>.
    </p>
        <p>
      <span class="emphasis"><em>igen</em></span> -- function table <span class="emphasis"><em>GEN</em></span> routine. Corresponds to p4 of the score <span class="emphasis"><em>f statement</em></span>.
    </p>
        <p>
      <span class="emphasis"><em>iarga, iargb, ...</em></span> -- function table arguments. Correspond to p5 through p<span class="emphasis"><em>n</em></span> of the score <span class="emphasis"><em>f statement</em></span>.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp111594624"></a>
        <h2>Performance</h2>
        <p>
      This is equivalent to table generation in the score with the <span class="emphasis"><em>f statement</em></span>.
    </p>
        <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
          <table border="0" summary="Note">
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              <td rowspan="2" align="center" valign="top" width="25">
                <img alt="[Note]" src="images/note.png" />
              </td>
              <th align="left">Note</th>
            </tr>
            <tr>
              <td align="left" valign="top">
                <p>Csound was originally designed to support tables with power of two sizes only. Though this has changed in recent versions (you can use any size by using a negative number), many opcodes will not accept them.</p>
              </td>
            </tr>
          </table>
        </div>
        <div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
          <table border="0" summary="Warning: Warning">
            <tr>
              <td rowspan="2" align="center" valign="top" width="25">
                <img alt="[Warning]" src="images/warning.png" />
              </td>
              <th align="left">Warning</th>
            </tr>
            <tr>
              <td align="left" valign="top">
                <p>
        Although Csound will not protest if ftgen is used inside instr-endin statements, this is not the intended or supported use, and must be handled with care as it has global effects. (In particular, a different size usually leads to relocation of the table, which may cause a crash or otherwise erratic behaviour.
      </p>
              </td>
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      <div class="refsect1">
        <a id="idp111599248"></a>
        <h2>Examples</h2>
        <p>
      Here is an example of the ftgen opcode. It uses the file <a class="ulink" href="examples/ftgen.csd" target="_top"><em class="citetitle">ftgen.csd</em></a>.

      </p>
        <div class="example">
          <a id="idp111601104"></a>
          <p class="title">
            <strong>Example 331. Example of the ftgen opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac     <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc    ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o ftgen.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span>   <span class="op">=</span>1

gisine   <span class="ohdr">ftgen</span> 1, 0, 16384, 10, 1	<span class="comment">;sine wave</span>
gisquare <span class="ohdr">ftgen</span> 2, 0, 16384, 10, 1, 0 , .33, 0, .2 , 0, .14, 0 , .11, 0, .09 <span class="comment">;odd harmonics</span>
gisaw    <span class="ohdr">ftgen</span> 3, 0, 16384, 10, 0, .2, 0, .4, 0, .6, 0, .8, 0, 1, 0, .8, 0, .6, 0, .4, 0,.2 <span class="comment">;even harmonics</span>

<span class="oblock">instr</span> 1

ifn <span class="op">=</span> p4
asig <span class="opc">poscil</span> .6, 200, ifn
     <span class="opc">outs</span> asig, asig

<span class="oblock">endin</span>
<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>

<span class="stamnt">i</span> 1 0 2 1 <span class="comment">;sine wave</span>
<span class="stamnt">i</span> 1 3 2 2 <span class="comment">;odd harmonics</span>
<span class="stamnt">i</span> 1 6 2 3 <span class="comment">;even harmonics</span>
<span class="stamnt">e</span>
<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
          </div>
        </div>
        <p><br class="example-break" />
    </p>
        <p>
      Here is another example of the ftgen opcode. It uses the file <a class="ulink" href="examples/ftgen-2.csd" target="_top"><em class="citetitle">ftgen-2.csd</em></a>.
      </p>
        <div class="example">
          <a id="idp111606384"></a>
          <p class="title">
            <strong>Example 332. Example of the ftgen opcode.</strong>
          </p>
          <div class="example-contents">
            <p>
          This example queries a file for it length to create an f-table of the appropriate size.
        </p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out   Audio in</span>
-odac           -iadc    <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o ftgen-2.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

  <span class="ohdr">sr</span>	    <span class="op">=</span>  48000
  <span class="ohdr">ksmps</span>	    <span class="op">=</span>  16
  <span class="ohdr">nchnls</span>    <span class="op">=</span>  2

<span class="comment">;Example by Jonathan Murphy 2007</span>

  <span class="ohdr">0dbfs</span>	    <span class="op">=</span>  1

    <span class="oblock">instr</span> 1

  Sfile	    <span class="op">=</span>    "beats.wav"

  ilen	    <span class="opc">filelen</span>   Sfile  <span class="comment">; Find length</span>
  isr	    <span class="opc">filesr</span>    Sfile  <span class="comment">; Find sample rate</span>

  isamps    <span class="op">=</span>  ilen <span class="op">*</span> isr  <span class="comment">; Total number of samples</span>
  isize	    <span class="opc">init</span>      1

<span class="olabel">loop</span><span class="op">:</span>
  isize	    <span class="op">=</span>  isize <span class="op">*</span> 2
<span class="comment">; Loop until isize is greater than number of samples</span>
<span class="octrl">if</span> (isize <span class="op">&lt;</span> isamps) <span class="octrl">igoto</span> <span class="olabel">loop</span>

  itab	    <span class="ohdr">ftgen</span>     0, 0, isize, 1, Sfile, 0, 0, 0
	    <span class="opc">print</span>     isize
	    <span class="opc">print</span>     isamps

  <span class="opc">turnoff</span>
    <span class="oblock">endin</span>

<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>
<span class="stamnt">i</span>1 0 10
<span class="stamnt">e</span>
<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
          </div>
        </div>
        <p><br class="example-break" />
    </p>
      </div>
      <div class="refsect1">
        <a id="idp111608912"></a>
        <h2>See also</h2>
        <p>
      <a class="link" href="ScoreGenRef.html" title="GEN Routines"><em class="citetitle">GEN routine overview</em></a>, <a class="link" href="ftgentmp.html" title="ftgentmp"><em class="citetitle">ftgentmp</em></a>
    </p>
      </div>
      <div class="refsect1">
        <a id="idp111611888"></a>
        <h2>Credits</h2>
        <p>
      </p>
        <table border="0" summary="Simple list" class="simplelist">
          <tr>
            <td>Author: Barry L. Vercoe</td>
          </tr>
          <tr>
            <td>M.I.T., Cambridge, Mass</td>
          </tr>
          <tr>
            <td>1997</td>
          </tr>
        </table>
        <p>
    </p>
        <p>Added warning April 2002 by Rasmus Ekman</p>
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